T Taurus - Taurus T type star

Japanese: おうし座 T 型星 - おうしざてぃーがたせい
T Taurus - Taurus T type star

...The former types include Wolf-Rayet stars, P Cygni stars, emission-type B stars, and supergiants, with P Cygni being a typical example of an emission-type star with an outflowing circumstellar sphere. Late types include emission-type M stars, long-period variables, and T Tauri stars. Flare stars and novae in an explosive state can also be considered types of emission-type stars. ...

From [Protostar]

…Fu Orionis is a similar object. Near the end of the Hayashi phase is a type of star called a T Tauri. It is a very young star in a star cluster that is not yet settled, and it is experiencing repeated large flares on its surface. …

From [Variable Stars]

Other examples of physical variables include nova type variables (also called cataclysmic variables) that suddenly change brightness, such as novae, supernovae, which are larger than novae and are the explosion of the entire star, and flare stars, which have been observed to have flares similar to large-scale solar flares (explosive phenomena on the surface of the sun). In addition, T Tauri stars, which are newborn stars from interstellar clouds, are physical variables that show irregular changes in light due to the aftermath of their birth.
[Pulsating variable stars]
As mentioned above, pulsating variables are stars whose brightness changes because the star itself expands and contracts periodically. Currently, there are more than 18,000 such stars known in the Milky Way Galaxy alone.

*Some of the terminology that refers to "T Taurus type stars" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…前者にはウォルフ=ライエ星,はくちょう座P型星,輝線B型星,超巨星などがあり,なかでもはくちょう座P型星は流出型星周圏をもつ輝線星の典型となっている。晩期型では輝線M型星,長周期変光星,おうし座T型星などが知られている。また,爆発状態にあるフレア星,新星なども輝線星の一種といえる。…

【原始星】より

…オリオン座FU星も同様な天体である。ハヤシ・フェーズの終りに近い星として,おうし座T型星と呼ばれる種類の星がある。これは非常に若い星団の中にある星で,まだ落ち着かず,星の表面で大規模なフレアを繰り返している。…

【変光星】より

…物理的変光星としてはそのほかに,新星に代表される突然明るさを大きく変える新星型変光星(激変星ともいう),新星より規模が大きく星全体の大爆発である超新星,太陽フレア(太陽面爆発現象)を大規模にしたようなフレアが観測されているフレア星などがある。また星間雲の中から生まれたばかりの星おうし座T型星は,誕生の際の余波で不規則な変光をする物理的変光星である。
【脈動変光星】
 すでに述べたように,脈動変光星は,星自身が規則的に膨張と収縮を繰り返しているために明るさが変わる星で,現在,銀河系の中だけで1万8000個以上知られている。…

※「おうし座 T 型星」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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